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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a7cb96d8aae0f325a5824af4a6caf2bf99910ad48deee499cd33e5dc0a0ebf9' 
  AND token = 'sexf3RtRdpPe+F6rtd1qhW7PIEqiX1EyA0biEx30p70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}